:root {
  color-scheme: dark;
  --terminal-bg: #050607;
  --terminal-green: #8ff0a4;
  --terminal-white: #d7ded7;
  --terminal-muted: #77847c;
  --terminal-error: #ff6b6b;
  --terminal-warning: #ffd166;
  --terminal-success: #7ee787;
  --panel-bg: rgba(11, 18, 20, 0.96);
  --panel-border: rgba(210, 235, 224, 0.46);
  --panel-text: #edf5ef;
  --panel-muted: #aec0b6;
  --accent: #66d9ef;
  --amber: #ffcf70;
  --danger: #ff7a90;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
  margin: 0;
}

body {
  min-height: 100vh;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(5, 6, 7, 0.12), rgba(5, 6, 7, 0.62)),
    #12191b;
  color: var(--panel-text);
  font-family: Inter, "Helvetica Neue", Arial, sans-serif;
}

button,
input {
  font: inherit;
}

.app-shell {
  position: relative;
  width: 100vw;
  height: 100vh;
  padding: 18px;
  display: grid;
  grid-template-rows: 1fr auto;
  gap: 12px;
}

.linux-stage {
  position: relative;
  min-height: 0;
  border: 1px solid rgba(150, 170, 160, 0.28);
  background: var(--terminal-bg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.linux-stage::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(255, 255, 255, 0.025) 50%, rgba(0, 0, 0, 0.045) 50%),
    radial-gradient(circle at 70% 12%, rgba(102, 217, 239, 0.12), transparent 28%);
  background-size: 100% 4px, 100% 100%;
  mix-blend-mode: screen;
}

.terminal-canvas {
  display: block;
  width: 100%;
  height: calc(100% - 54px);
}

.command-bar {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 54px;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 10px;
  padding: 0 18px;
  border-top: 1px solid rgba(150, 170, 160, 0.24);
  background: rgba(3, 4, 5, 0.96);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.prompt-label {
  color: var(--terminal-green);
  white-space: nowrap;
}

.command-input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--terminal-white);
  caret-color: var(--terminal-green);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 16px;
  letter-spacing: 0;
}

.learning-panel {
  position: absolute;
  top: 34px;
  right: 34px;
  width: min(390px, calc(100vw - 68px));
  max-height: calc(100vh - 132px);
  overflow: auto;
  padding: 18px;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(20, 32, 34, 0.98), var(--panel-bg));
  backdrop-filter: blur(4px) saturate(1.06);
  -webkit-backdrop-filter: blur(4px) saturate(1.06);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    0 18px 54px rgba(0, 0, 0, 0.22);
}

.panel-kicker {
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.learning-panel h1 {
  margin: 8px 0 8px;
  color: var(--panel-text);
  font-size: 21px;
  line-height: 1.3;
  letter-spacing: 0;
}

.learning-panel p {
  margin: 0;
  color: var(--panel-muted);
  font-size: 14px;
  line-height: 1.75;
}

.goal-list {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.goal-item {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 8px;
  align-items: start;
  color: #dbe8df;
  font-size: 13px;
  line-height: 1.55;
}

.goal-mark {
  display: inline-grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border: 1px solid rgba(219, 232, 223, 0.38);
  color: var(--terminal-muted);
  font-size: 11px;
}

.goal-item.done .goal-mark {
  border-color: rgba(126, 231, 135, 0.7);
  color: var(--terminal-success);
}

.panel-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.panel-actions button {
  border: 1px solid rgba(220, 235, 226, 0.24);
  border-radius: 6px;
  background: rgba(237, 245, 239, 0.08);
  color: var(--panel-text);
  padding: 8px 12px;
  cursor: pointer;
}

.panel-actions button:hover {
  background: rgba(102, 217, 239, 0.14);
  border-color: rgba(102, 217, 239, 0.48);
}

.panel-actions button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.hint-text {
  min-height: 22px;
  margin-top: 12px;
  color: var(--amber);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  line-height: 1.55;
  white-space: pre-wrap;
}

.status-strip {
  min-height: 54px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.status-strip > div {
  border: 1px solid rgba(160, 190, 178, 0.24);
  background: rgba(8, 13, 14, 0.82);
  padding: 9px 12px;
}

.status-label {
  display: block;
  color: var(--terminal-muted);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
}

.status-strip strong {
  display: block;
  margin-top: 3px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 15px;
  color: var(--terminal-white);
  letter-spacing: 0;
}

@media (max-width: 760px) {
  body {
    overflow: auto;
  }

  .app-shell {
    min-height: 100vh;
    height: auto;
    padding: 10px;
  }

  .linux-stage {
    min-height: 72vh;
  }

  .learning-panel {
    position: static;
    width: auto;
    max-height: none;
    order: 2;
  }

  .status-strip {
    grid-template-columns: 1fr;
    order: 3;
  }
}